Log 3(x-3)+log3 x=log3 4

Question

Log 3(x-3)+log3 x=log3 4

Answer 1

ОДЗ
x > 3 

(x - 3) * x = 4 
x^2 - 3x - 4 = 0 
D = 9 + 16 = 25
x1 = ( 3 + 5)/2 = 4;
x2 = ( 3 - 5)/2 = - 1; не удовлет ОДЗ